<template>
  <div class="bottom-bar">
    <check-button
      :checked="isSelectAll"
      class="select-all"
      @click.native="checkClick" />
    <span>全选</span>
    <span class="total-price">合计：{{totalPrice}}</span>
    <span class="buy-product" @click="calcClick">去计算({{checkLength}})</span>
  </div>
</template>
<script>
import CheckButton from 'components/content/checkButton/CheckButton'
import {mapGetters} from 'vuex'

export default {
  name: "CartBottomBar",
  components: {
    CheckButton
  },
  computed: {
    ...mapGetters(['cartList']),
    totalPrice(){
      return '￥' + this.cartList.filter(item => {
          return item.checked
        }).reduce((preValue, item) =>{
          return preValue + item.price * item.count
        }, 0).toFixed(2)
    },
    checkLength(){
      return this.cartList.filter(item => item.checked).length
    },
    isSelectAll(){
      if(this.cartList.length === 0) return false
      //1.数组的高阶函数写法 filter
      // return !(this.cartList.filter(item => !item.checked).length)
      //2.find写法
      // return !this.cartList.find(item => !item.checked)
      //3.for循环写法
      for(let item of this.cartList){
        if(!item.checked){
          return false
        }
      }
      return true
    }
  },
  methods:{
    checkClick(){
      if(this.isSelectAll){//全部选中
        this.cartList.forEach(item => item.checked = false)
      }else{
        this.cartList.forEach(item => item.checked = true)
      }
    },
    calcClick(){
      if(!this.isSelectAll){
        console.log(this.$toast)
        this.$toast.showMessage('请先选择购买的商品', 1500)
      }
    }
  }

}
</script>
<style scoped>
  .bottom-bar {
    width: 100%;
    height: 44px;
    background-color: #eee;
    position: fixed;
    bottom: 50px;
    left: 0;
    box-shadow: 0 -2px 3px rgba(0, 0, 0, .2);
    font-size: 14px;
    color: #888;
    line-height: 44px;
    padding-left: 35px;
    box-sizing: border-box;
  }
  .bottom-bar .select-all {
    position: absolute;
    line-height: 0;
    left: 12px;
    top: 13px;
  }
  .bottom-bar .total-price {
    margin-left: 15px;
    font-size: 16px;
    color: #666;
  }
  .bottom-bar .buy-product {
    background-color: orangered;
    color: #fff;
    width: 100px;
    height: 44px;
    text-align: center;
    line-height: 44px;
    float: right;
  }
</style>
